Importing CSVs first draft
More feedback on import process
Import process robustified
First working version with webform
Updated dbh height and tree heigh minimums.
Adding server setup notes
Check mime type
Allow excel exported csv files
deleted tree_height, added dbh_year and dbh_growth_cm.

dbh_year: year of first dbh measurement
dbh_growth_cm: dbh (measured in cm) + growth (measured in mm)
chaged bdh_date to bdh_year
Altered some validations and added quality code columns
Fixing database connection release on thread
Adding monthly averages table and altering some validation.
Updating styling
Updating various from Terhi feedback
Adding normalised tables
Adding plot metadata
Adding uniqueness contraints to normalised tables
Updating gems
Ignore data